Final answer:
The correct answer is b) Complex restricted activities, which are necessary for LPNs to set fractures and apply casts. These procedures are advanced and require additional authorization.
Step-by-step explanation:
LPNs (Licensed Practical Nurses) who wish to set a fracture and/or apply a cast are typically required to engage in more specialized activities that go beyond the basic care they provide. The correct answer to which kind of restricted activities LPNs must have to set a fracture and/or apply a cast is b) Complex restricted activities. Such procedures are generally considered advanced practice and require additional training, certification, and the presence of or authorization by a registered nurse or physician.